BEFORE ANY MASK EXISTS

A chip is designed entirely in software first

software, long before silicon

Every mask this course has described starts as a design file, built and checked entirely in software months or years before a wafer ever enters a fab. That design software is its own specialized industry, separate from both the fab and the equipment makers.

A chip exists as pure design for a long time before it exists as silicon.

EDA TOOLS

Electronic design automation

software that designs, simulates, and verifies

EDA, electronic design automation, is the category of software used to turn a chip's intended behavior into a manufacturable layout: placing and routing standard cells, running the design rule checks covered earlier, and simulating the design before it's ever built.

Nearly every step this course covered on the design side runs through EDA software.

THE DESIGN FLOW

From behavior to a mask set

Logic design Describes what the chip should do, not yet how it's laid out

Synthesis Converts that logic into a specific set of standard cells

Place and route Arranges those cells and wires them through the metal stack

Verification and DRC Checks the result against both intent and the fab's rule book

Tapeout Sends the finished, verified design to the fab as mask data

Tapeout is the moment a design stops being software and starts becoming a mask.

WHY SO FEW EDA COMPANIES

Two companies dominate the whole category

Synopsys and Cadence

Two companies, Synopsys and Cadence, supply most of the industry's EDA software. Building a competing tool chain would take decades of accumulated engineering, which keeps this corner of the industry nearly as concentrated as fab construction itself.

EDA is proof that a barrier to entry doesn't have to be a factory: it can be decades of software.

UNIT 46 STUDY COMPLETE

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Ready for the Fab Challenge?

You've covered the software that designs, simulates, and verifies a chip before any mask exists.